Dental instrument.



E. L. OHOTT. DENTAL INSTRUMENT. APPLICATION FILED APR.9,1909.

Patented NOV. 2, 1909.

UNITED STATES PATENT OFFICE.

DWARD L. CHOTT, OF CHICAGO, ILLINOIS, ASSIGNOR F ONE-HALF TO HUGO J. CI-IOTT,

OF CHICAGO, ILLINOIS.

DENTAL INSTRUMENT.

8,640. Specification of Letters Patent. Patentd NOV. 2, 1909.

Application filed. April 9, 1909. Serial No. 488,798.

all whom it may concern: reciprocate in the cylinder between the disks Be it known that I, EDW'ARD L, OHOTT, a 6 and 7 which limit the length of the ham-- izen of the United States, residin at Chimet Strokes. go, county of Cook, and The tool holding head is tapered and is ve invented certain new and useful Improvided with an axial bore 11 in the smallovements in Dental Instruments, of which est portion thereof, the threaded axial refollowing is a specification. cess 12 being smaller diametrically than said My invention relates to improvements in bore and adapted to receive the threaded end ital instruments, and more particularly to 13 of any of the interchangeable tools pro levice designed for use in setting crowns Vid d in the device. Each tool is provided d for removing crowns and bridge-work, With a conical portion 14 adjacent the object of the invention being to provide threaded end 18 thereof, which portion is inexpensive device of this character which adapted to fit snugly in a flaring portion 15 ll be convenient in use. provided at the outer extremity of the head a further object of my invention is to pro- 5, whereby the tool is held firmly in position. e means in the device for cushioning the The tapering tool 17 is in axial alinement cks caused by the hammer of the device With the cylinder 1 and is provided with a that the same will not be transmitted to hook 18 having a series of teeth 19, this tool teeth of the patient. being adapted to remove bridge-work.

ther objects will appear hereinafter. Various slight changes might be made in Vith these objects in view my invention the general form and arrangement of parts sists in the novel construction and ardescribed without departing from my invengement of parts as will be hereinafter tion, and hence I do not restrict myself to y described and particularly pointed out the precise details set forth, but consider he claims. myself at liberty to make such changes and ly invention will be more readily under alterations as fairly fall within the spirit d by reference to the accompanying and scope of the claims.

wings forming a part of this specifica- I-Iavmg described my invention what I and in which, claim as new and des1re to secure by Letters lgure 1 1s a slde elevation of my 1m- Patent 1s:

ved dental instrument in its preferred 1. In a dental instrument, a cylinder havn, Fig. 2 is a central longitudinal section ing internally threaded ends, a head screwed *eof, and Fig. 3 is a side elevation showinto one of said ends having an axial pera handle in the extended position. foration and a knurled periphery, a cylineferring now to the drawings 1 desigdrical hammer adapted to reciprocate in s a cylinder internally threaded at each said cylinder having a rod integral therethereof, and 2 a plunger or hammer with adapted to reciprocate in said axial ted to reciprocate therein. A knurled perforation, a knurled tool-holding head l 3 provided with an axial perforation l screwed into the other end of said cylinder, rewed into one end of the cylinder 1, and and a knurled operating handle secured to urled tool holding head 5 is screwed into said rod, said hammer being adapted to conother end thereof. A disk 6 of rubber, tact with cushions provided at the inner ends or other yieldable material is placed at of said heads, substantially as described. nner end of the head 5 to receive the im- 2. In a dental instrument, a cylinder havof the hammer 2 when setting crowns, ing heads secured therein at each end therea perforated yieldable disk 7 is placed of, a cylindrical hammer adapted to reciproe inner end of the head 3 to receive the cate in said cylinder having a reduced porct of the shoulder S of the hammer 2 tion or rod adapted to reciprocate in an axial a crown or bridge-W01: is being reperforation provided in one of said heads, d. The rod 9 is integral with the ham a handle attached to said rod, a disk cushion 2 and is adapted to reciprocate in the seated at the inner end of one of said heads ration 4: provided in the head 3, the and a perforated disk cushion seated at the end of said rod being threaded to reinner end of the other, said hammer being the knurled handle 10 which is rigidly adapted to contact with said cushions, a *ed thereto. Thus the hammer 2 may threaded axial recess provided in one of said heads, and a tool adapted to screw into said cess having a toothed hook at the outer exrecess, substantially as described. tremity thereof for removing bridge-work, 3. In a dental instrument, a cylinder havsaid tool being provided with a conical poring a tool-holding head screwed into one end tion formed thereon for engaging said flarthereof and a perforated head screwed into ing portion of said last named head, subthe other, a hammer adapted to reci rocate stantially as described.

in said cylinder having a rod integra there- In testimony whereof I have signed my with adapted to reciprocate in said perfoname to this specification in the presence of ratgld head, an opferatinghhandle secured to two subscribing Witnesses.

sai rod, means or cus ioning the shocks caused by the impact of said hammer on said EDWARD GHOTT heads, a flaring portion, bore, and a threaded Witnesses: recess provided in said tool-holding head, JOSHUA R. H. Form, and a removable tool screwed into said re- W. H. GRIFFIN. 

